It depends on the "Team cluster" field which is available at the account level.
When a new record is created (RS, S&P or devpool):
- If Team cluster = "Channel Partners" ==> Market cluster = "Channel Partners"
- If Team cluster = another value ==> Market cluster depends on the End use
Please check the end use mapping on the setup part.
If a user asks you why a specific Market cluster is used, guide her/him to the File tab > "Library " tab (referential). If she/he needs more explanations, ask her/him to refer to the CRM Champion or Data Steward. Same comment for Team cluster.